Carbon-based material for electron emission source, electron emission source containing the carbon-based material, electron emission device including the electron emission source, and method of preparing electron emission source

• Main Author: CHO SUNG-HEE
• Format: Patent
• Language: English
• Published: 29.05.2008
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

A carbon-based material for electron emission sources, electron emission sources containing the carbon-based material, an electron emission device including the electron emission sources, and a method of preparing the electron emission sources are provided. The carbon-based material has a carbon-based material having at least one characteristic selected from the group consisting of a ratio of h2 to h1 (h2/h1)<1.3, and the ratio of FWHM 2 to FWHM 1 (FWHM 2 /FWHM 1 )>1.2, where the h2 denotes the relative intensity of a second peak which is a peak in a Raman shift range of 1350±20 cm-1, and the h1 denotes the relative intensity of a first peak which is a peak in a Raman shift range of 1580±20 cm-1 in the Raman spectrum obtained by the radiation of a laser beam having a wavelength of 488±10 nm, 514.5±110 nm, 633±10 nm or 785±10 nm, the FWHM 2 denotes the full width at half maximum of the second peak, and the FWHM 1 denotes the full width at half maximum of the second peak. The electron emission sources containing the carbon-based material have long lifespan and a high current density.